MASTER LOCK UNIV SEC CAB-BLK The Master Lock is both a physical and visual deterrent to theft. The cable comes in four colors (black, blue, red and purple), acting as a visual deterrent. It can be used to secure portable computers, or other desktop items such as external drives, large modems, scanners, printers, etc. It's also designed for in the office, on the road, or at home. The Master Lock is compatible with 80% of all notebook computers sold today. You can also use the Security Slot Adapter Kit which installs in seconds. Easily secures camcorders, cell phones, personal stereos, and more. Just wrap the 6 foot steel cable around any immovable object. Insert the lock into the Kensington Security Slot on your notebook computer and turn the key. It's that easy!